Lewis n



(No Model.)

L. N. TONNS. SPAR FOR vBssBLs,

WITNESSES: j INVENTOR y BY 4 1 4% H/f ATTORNEY UNITED STATES PATENT OFFICE.

LEYVIS N. TONNS, OF ERIA-STINA, ASSIGNOR OF TNVO IHIRDS TO EDWARD H. HALL, OF BROOKLYN, AND GEORGE H. ALLEN, OF NEW YORK, N. Y.

SPAR FOR VESSELS.

SPECIFICATION forming part of Letters Patent No. 499,808, dated June 20, 1893. Application filed May 4, 1892. Serial No. 431,819. (No model.)

To all whom it may concern.-

Be it known that I, LEWIS N. TONNS, of Eriastina, Richmond count-y, State of New York, have invented a certain new and useful Improvement in Spars for Vessels, of which the following is a specification.

I will describe in detail a vessels spar embodying my improvement, and then point out the novel features in claims.

IO In the accompanying drawings, Figure l, is a longitudinal section of'a, spar embodying my improvement taken on the plane of the line m to, Fig. 2. 'Fig. 2, is a transverse section thereof taken on the plane of the line y 3 Fig. 1. Fig. 3, is a transverse section taken on the plane of the'lin .Z .2','Fig.1. Fig. 4, is

' a longitudinal section 0 'a'spar of modified form embodying my improvement. Fig.- 5, is a transverse section thereof taken on the plane of the line 3 s, Fig. at. Fig. 6, is a transverse section of aspar of'still another modified form.

Similar letters of reference designate corresponding parts inall the figures.

Referring first to the example of my improvement illustrated in Figs. 1, 2 and 3, A designates portions or sections of the spar. These portions as shown are approximately fiat where they meet and have semi-circular exterior surfaces. When placed together, as shown more clearly in Figs. 2 and 3, they will form a spar of approximately cylindrical outline. Each of these portionsA is hollowed out at intervals throughout its length thereby forming recesses B. These recesses are so formed that when the portions A are placed together they will be opposite each other, so that approximately cylindrical hollow spaces will be formed in the interior of the spar. Between the recesses B, portions or of the wood 0 portions are opposite each other when the portions A are placed together so that what I term joints are formed between the hollowed out'portions of. the spar. As shown the faces of these portions (1 are in close contact when I the portions A are placed together. The portions A may be secured together in any convenient manner, but I have shown a simple and effective means of accomplishing this, consisting in passing bolts 1) transversely through the portions a after the parts A have of which the spar is formed are left, and these been placed together. These bolts cross each other, as shown, at approximately right angles. I prefer that the bolts 1) shall he so short that 'when in place they will not extend to the outside of the spar; and to accomplish this the apertures for the bolts near their outer -in Figs. 4 and 5, the recesses B are continuous throughout the length of the mast. Instead of leaving portions a of the Wood of the mast to form the joints I'einploy metal joints. 7o Thesejoints consist of two portions (2 of frame like construction as shown, and of hemi-sphe-rical outline. On their curved sides they are provided with screw holes adapted to receive screws 0, by means of which they are secured each in one ofthe portionsAprevious to the portionsA being brought together. On their meeting sides these portions or are constructed to form dovetail joints. Then the portions A of the spar are to be secured together they are placed with their inner sides against each other, and one orboth are then moved longitudinally in such manner that the dovetail tongue or tongues upon one of the portions a will enter and engage the dovetail groove or grooves upon the other portion a.

It is to be understood that the joints, each consisting of separable portions in both examples of my improvement are to be arranged at any desired intervals in the spar.

I wish it to be understood that I do notlimit myself to the use of two portions A as I may use four or any other suitable or desired number. -I have shown a spar composed of four portions A in Fig. 6.

By my improvement a light and yet strong spar is constructed, which, owing to the joints will resist great lateral strain. 1

What I claim as my invention, and desire to secure by Letters Patent, is

1. A spar comprising internally hollowed out sections, each section having portions of cesses, a number of internal joints formed by the wood of the spar between the recesses, 5 and bolts/and dowels securing said sections together at the joints, substantially as specified.

In testimony whereof I have signed my name to thisspecification in the presence of 20 two subscribing witnesses.

LEWIS N. TONNS.

NVitnesses:

ANTHONY GREF, WM. A. PoLLocK. 

